These tankers were to refuel the ships from the Eastern Fleet that were to participate in operation Diplomat. During operation Diplomat the Eastern Fleet proceeded to the south-west of Cocos Island where the US aircraft carrier USS Saratoga (Capt. J.H. Cassady, USN) and the US destroyers USS Cummings (Cdr. P.D. Williams, USN), USS Dunlap (Cdr. C. Iverson, USN) and USS Fanning (Cdr. R.M. MacKinnon, USN).

Tanker Arndale had been detached after fuelling on the 25th escorted by HrMS Tjerk Hiddes which was suffering from defects.
The other two oilers were detached after fuelling on the 26th still escorted by HrMs Tromp. (2)

During the forenoon of the 17th the four 'N' class and two 'P' class destroyers of Force 69 were fuelled by HMS Newcastle, HMS Nigeria, HMS Ceylon, HMNZS Gambia. The three 'Q' class destroyers from Force 70 were fuelled by HMS Renown and HMS London.

On the 18th HMS Ceylon and HMNZS Gambia were transferred from Force 69 to Force 70 to bolster the latters AA defence. (On the 19th HMS Nigeria replaced HMS Ceylon in this force as HMS Ceylon had problems with one shaft and could only make 24 knots.) At sunset Force 70 was detached so as to arrive at the flying off position for the aircraft at 0530/19.

At 0530/19 the carriers launched 46 bombers and 37 fighters (17 Barracudas and 13 Corsairs from HMS Illustrious and 11 Avenges, 18 Dauntless and 24 Hellcats from USS Saratoga) to attack Sabang and nearby airfields. Besides that 12 fighters were launched to patrol overhead of both Task forces.

The enemy was taken completely by surprise and 24 Japanese aircraft were destroyed on the ground. Only 1 fighter, a Hellcat from the Saratogs, was lost on the Allied side and it's pilot was rescued out of the water by the British submarine HMS Tactician (Lt.Cdr. A.F. Collett, DSC, RN). All aircraft, except the one lost, had returned to the carriers by 0930 hours after which both task forces retired to the west. The Japanese tried to attack the Allied task force with three torpedo bombers but these were shot down by Allied fighter aircraft at 1010 hours.

At Sabang the Japanese merchants Kunitsu Maru (2722 GRT, built 1937) and Haruno Maru (775 GRT, built 1927, former Dutch Kidoel) were sunk by the Allied aircraft while the Japanese minelayer Hatsutaka was damaged.

At 0800 hours on the 20th the fleet set course to return to Trincomalee. The cruisers and destroyer meanwhile carried out attack exercises. (3)

6 May 1944

Operation Transom,
Carrier raid against Surabaya by the Eastern Fleet.

On 10 May 1944, the Dutch light cruiser Tromp and the destroyers were fuelled at sea by the capital ships and the cruisers. During fuelling from HMS Valiant the Dutch destroyer HrMs Van Galen sustained some minor damage (fractured hull plate on her port side) but the crew of the Van Galen was able to effect emergency repairs.

On 15 May 1944, task forces 65 and 66 were fuelled at Exmouth Gulf, Australia by Task Force 67 which was made up of of six Royal Fleet Auxiliary tankers; Eaglesdale (8032 GRT, built 1942), Echodale (8150 GRT, built 1941), Easedale (8032 GRT, built 1942), Arndale (8296 GRT, built 1937), Pearleaf (5911 GRT, built 1917), Appleleaf (5891 GRT, built 1917) and supplyship (used as distilling ship) Bacchus (3154 GRT, built 1936). This force had already left Trincomalee on 30 April and was escorted by the British heavy cruisers HMS London (Capt. R.V. Symonds-Tayler, DSC, RN), HMS Suffolk (Capt. A.S. Russell, DSO, RN). They had also been escorted near Ceylon by a local escort for A/S purposes, this local escort had been made up of the British destroyer HMS Rotherham, Dutch destroyer HrMs Van Galen and the British frigate HMS Findhorn (Lt.Cdr. J.C. Dawson, RD, RNR). The local escort returned to Ceylon on 5 May 1944. The two cruisers mentioned above now joined Task Force 66. Later this day Task Forces 65 and 66 went to sea again for the actual attack on Surabaya. On leaving Exmouth Gulf the fleet was spotted by the merhant vessel Aroona. This ship was now instructed to put into Exmouth Gulf and was held there by HMAS Adelaide (A/Capt. J.C.D. Esdale, OBE, RAN) for 24 hours and to impress on the master and crew of this vessel the necessity of not disclosing any information concerning the Fleet on the arrival of their ship at Fremantle (their next port of call).

In the early morning hours of the 17th the carriers launched 45 dive bombers and 40 fighters for an attack on the harbour and oil installations (Wonokromo oil refeniry) of Surabaya, Netherlands East Indies. (USS Saratoga: 12 Avengers (1 had to return with engine trouble shortly after being launched), 18 Dauntless, 24 Hellcats; HMS Illustrious: 18 Avengers (2 of which force landed in the sea shortly after being launched), 16 Corsairs). On the ground they destroyed 12 enemy aircraft (20 were claimed). The damage to the harbour and shipping were over estimated (10 ships were thought to have been hit) as in fact only the small transport ship Shinrei Maru (987 GRT, built 1918) was sunk and patrol vessel P 36, auxiliary submarine chasers CHa-107 and CHa-108, tanker Yosei Maru (2594 GRT, built 1928, former Dutch Josefina) and cargo ships Choka Maru (???? GRT, built ????) and Tencho Maru (2716 GRT, built 1919) were damaged.

On the 18th the US ships were released. The other ships then proceeded to Exmouth Gulf where they arrived to fuel the next day before starting on the return trip to Ceylon less destroyer HMAS Quiberon which was to refit in Australia and was sent to Fremantle.

On 23 May 1944, the Dutch light cruiser Tromp and the destroyers were fuelled at sea by the capital ships and the cruisers.

Task Force 65 and 66 arrived back at Trincomalee on the 27th.

During this operation several US Submarine guarded the passages to the Indian Ocean to spot a possible Japanese counter attack. The submarines deployed for this purpose were the following;
In the Sunda Strait from 12 to 23 May 1944; USS Angler (Cdr. R. I. Olsen, USN) and USS Gunnel (Cdr. J.S. McCain, Jr., USN).
South of Lombok Strait from 13 to 20 May 1944; USS Cabrilla (Cdr. W.C. Thompson, Jr., USN) and also the USS Bluefish (Cdr. C.M. Henderson, USN) from 13 May until the night of the 16th.
South of Bali Strait from 17 to 20 May; USS Bluefish.
North of Bali Strait; USS Puffer (Cdr. F.G. Selby, USN) during the night of 16/17 May.

The following US Submarines were deployed in the Surabaya area for air/sea rescue duties; USS Puffer in the Madura Strait about 40 miles to the east of Surabaya.
USS Rasher (Cdr. W.R. Laughton, USN) in the Java Sea about 40 miles to the north of Surabaya. (4)